CN102731000B - Method for producing building gesso by using semi-hydrated phosphogypsum and dihydrate phosphogypsum - Google Patents
Method for producing building gesso by using semi-hydrated phosphogypsum and dihydrate phosphogypsum Download PDFInfo
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- CN102731000B CN102731000B CN 201210217290 CN201210217290A CN102731000B CN 102731000 B CN102731000 B CN 102731000B CN 201210217290 CN201210217290 CN 201210217290 CN 201210217290 A CN201210217290 A CN 201210217290A CN 102731000 B CN102731000 B CN 102731000B
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Abstract
The present invention discloses a method for producing building gesso by using semi-hydrated phosphogypsum and dihydrate phosphogypsum, and belongs to the field of building gypsum production, wherein the building gesso has characteristics of small water requirement of normal consistency and high strength. The method comprises processes of raw material calcination, grinding and aging, wherein the raw materials comprise, by weight, 5-60% of semi-hydrated phosphogypsum, and 40-95% of dihydrate phosphogypsum. According to the present invention, the match use of the semi-hydrated phosphogypsum andthe dihydrate phosphogypsum is adopted, and the ratio of the semi-hydrated phosphogypsum to the dihydrate phosphogypsum is strictly controlled, such that the disadvantage of single use of the semi-hydrated phosphogypsum or the dihydrate phosphogypsum is overcome, performances of the semi-hydrated phosphogypsum and the dihydrate phosphogypsum can be supported each other, and the prepared building gesso has characteristics of small water requirement of normal consistency and high strength; and the phosphogypsum is adopted to replace the natural gypsum to produce the building gesso so as to reduce production cost, change the phosphogypsum waste into treasure, effectively treat pollution and hazard on the environment due to phosphogypsum waste, and provide good environmental benefits, social benefits and economic benefits.
Description
Technical field
The invention belongs to the plaster of Paris production field, be specifically related to a kind of method of utilizing half water and phosphogypsum dihydrate to produce building gypsum plaster.
Background technology
Phosphogypsum is to produce the solid slag of getting rid of in the process phosphoric acid, 1 ton of P of every production
2O
5Can get the dried slag phosphogypsum of 4-5 ton.According to the difference of wet method phosphoric acid manufacture process, the phosphogypsum composition of by-product is also different, is CaSO such as the phosphogypsum major ingredient of two water law phosphoric acid process by-products
42H
2O, the phosphogypsum major ingredient of half water law phosphoric acid process by-product is CaSO
41/2H
2O.Use the enterprise of two wet technologies production phosphoric acid more both at home and abroad, therefore many to the research and comparison of phosphogypsum dihydrate, and use it to replace plaster of paris production plastering also to be widely used, be that the Chinese patent CN1844009 of 2006-10-11 has introduced a kind of method of utilizing phosphogypsum to prepare plaster of Paris such as the open date, the method is used carbonate stone flour pre-treatment phosphogypsum dihydrate, then dinectly bruning becomes terra alba, and product meets the requirement of GB GB9776-88.Use phosphogypsum dihydrate to prepare building gypsum plaster and have following shortcoming: (1) phosphogypsum dihydrate needs a large amount of energy consumptions in being sintered into the semi-hydrated gypsum process, part energy consumption is used for the free-water of oven dry phosphogypsum, and another part energy consumption is used for removing the crystal water of 1.5 molecules; (2) the building gypsum plaster standard consistency water requirement of phosphogypsum dihydrate preparation is large, and intensity is low, and the oven dry energy consumption is high during for the production of paper panel and building block; (3) building gypsum plaster of phosphogypsum dihydrate preparation is fast time of coagulation, and the presetting period, construction operation time was short during for the production of brushing gypsum generally at 3-5 minute, needs to add retardant and prolongs time of coagulation.
With respect to phosphogypsum dihydrate, owing to use the enterprise of half wet technology production phosphoric acid few, so directly utilize document that half water phosphogypsum prepares terra alba seldom, foreign literature " Influence of the technological parameters on the structure and properties of hemi-hydrate phosphogypsum " is although half water phosphogypsum crystal structure degree of record industrial by-product is higher, but pattern is irregular, and solubleness is very low, so directly the terra alba intensity of oven dry preparation is low, at present, although prepared by control technique in the laboratory and to have had close-burning half water phosphogypsum, but only need the just terra alba of processability excellence of oven dry free-water, it is different with foreign matter content that yet this method is confined to the source of raw ore, is difficult to realize in industrial production.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method of utilizing half water and the building gypsum plaster that phosphogypsum dihydrate production standard denseness water requirement is few, intensity is high.
The technical solution adopted for the present invention to solve the technical problems is: utilize half water and phosphogypsum dihydrate to produce the method for building gypsum plaster, comprise raw material calcining, grinding and ageing operation, described raw material is half water phosphogypsum 5～60% by weight, phosphogypsum dihydrate 40～95%.
Further, described raw material is half water phosphogypsum 5～30% by weight, phosphogypsum dihydrate 70～95%.
Further, described raw material is half water phosphogypsum 15～25% by weight, phosphogypsum dihydrate 75～85%.
Wherein, in the aforesaid method, the calcination process drop temperature is controlled at 140～200 ℃.
Further, the calcination process drop temperature is controlled at 160～180 ℃.
Wherein, in the aforesaid method, in the powder-grinding process control properties of powder performace be the 0.2mm square hole sieve tail over≤10%.
Wherein, in the aforesaid method, digestion time is 3～7 days.
The invention has the beneficial effects as follows: according to the aquation-hardening mechanism of gypsum, the process of setting of gypsum slurry is exactly the forming process of crystalline texture net.The contriver finds, the solubleness of the β semi-hydrated gypsum that the phosphogypsum dihydrate frying becomes is high, and the standard consistency water requirement is large, can generate a large amount of nucleus within a short period of time, grows up and form the crystalline texture net during aquation-sclerosis, so that the slurry presetting period is fast, has certain early strength; When these Structure Networks continue to grow up, will produce crystalline stress, along with structure is more closely knit, the hydrate crystal that forms is more, and crystalline stress is also just larger, when limit that crystalline stress can bear greater than structure at that time, will cause structure deteriorate, make final hardenite strength decreased.Half water phosphogypsum is then opposite, the degree of crystallinity of half water phosphogypsum is better, solubleness is lower, the standard consistency water requirement greatly reduces with respect to the β semi-hydrated gypsum, gypsum generates nucleus, grows up and forms the crystalline texture net slowly when aquation-sclerosis, so that the slurry presetting period is long, early strength is very low; When these Structure Networks continue to grow up, when structure was closely knit, the crystalline stress that is not enough to produce crystalline stress or generation can not destroyed the crystalline texture net, so that these crystalline textures are grown larger and larger along with the carrying out of aquation-process of setting, until reaction finishes, final hardenite intensity is higher.Half water phosphogypsum directly is dried into terra alba does not have gelling, and phosphogypsum dihydrate is sintered into terra alba and has good gelling property, and shortcoming is to remove free-water in the calcination process and crystal water needs a lot of energy consumptions.
Therefore, the present invention is used half water and phosphogypsum dihydrate, and strictly control its proportioning, overcome the shortcoming of independent use half water or phosphogypsum dihydrate, half water and phosphogypsum dihydrate are supported on performance mutually, obtained unforeseeable technique effect, not only the standard consistency water requirement is few to make the building gypsum plaster that makes, and intensity is high; Time of coagulation can also be regulated by different proportioning raw materials; In the calcining process of terra alba, a large amount of energy consumptions and time can be reduced, again because the terra alba water requirement of preparation significantly reduces, so in the baking operation of producing Thistle board and gypsum block, also can save a large amount of energy consumptions and time, reduced production cost, improved output; Replace the plaster of paris with phosphogypsum and produce building gypsum plaster, reduced production cost from raw material again, phosphogypsum is turned waste into wealth, effectively administered pollution and the harm of phosphogypsum slag to environment, have good environmental benefit, Social benefit and economic benefit.
Embodiment
The invention will be further described below by embodiment.
Utilize half water and phosphogypsum dihydrate to produce the method for building gypsum plaster, comprise raw material calcining, grinding and ageing operation, described raw material is half water phosphogypsum 5～60% by weight, phosphogypsum dihydrate 40～95%.
The present invention produces building gypsum plaster according to above proportioning just can guarantee the plaster of Paris quality for preparing, can save a large amount of energy consumptions again.
Preferably, for the building gypsum plaster better quality, described raw material is half water phosphogypsum 5～30% by weight, phosphogypsum dihydrate 70～95%.
The contriver finds by test, producing energy consumption that plaster of Paris saves by the inventive method increases and increases along with the addition of half water phosphogypsum, plaster of Paris intensity is first along with the addition of half water phosphogypsum increases and increases, when amount to be added reaches 20% left and right sides, the terra alba bending and compressive strength reaches maximum value, then the addition along with half water phosphogypsum increases and reduces, therefore, in order to make the best in quality of building gypsum plaster, described raw material is half water phosphogypsum 15～25% by weight, phosphogypsum dihydrate 75～85%.
Preferably, aforesaid method calcination process drop temperature is controlled at 140～200 ℃.Drop temperature is that drop temperature is excessively low below 140 degree, contains the dihydrate gypsum of quite a few in the plaster of Paris, and plaster of Paris intensity is low, and prolong time of coagulation; Drop temperature contains the great amount of soluble dehydrated gyp-in the plaster of Paris when 200 degree are above, water requirement increases, and it is fast to condense, and has false set, and quality is unstable.
The contriver finds that by test the calcination process drop temperature is in the time of 160 ℃～180 ℃, and dihydrate gypsum and dehydrated gyp-content are few in the building gypsum plaster, therefore the terra alba quality of preparation is good, stable performance, therefore, the calcination process drop temperature preferably is controlled at 160～180 ℃.
Gypsum is through behind the ball milling, and specific surface area significantly increases, standard consistency water requirement decrease, intensity is corresponding improving a lot also, shorten time of coagulation, therefore, in the aforesaid method, in the powder-grinding process preferred control properties of powder performace be the 0.2mm square hole sieve tail over≤10%.
Preferably, in order to make the plaster of Paris performance more stable, in the aforesaid method, digestion time is 3～7 days.
Following while, embodiment was further described the specific embodiment of the present invention, but therefore protection scope of the present invention was not limited among the embodiment.
Embodiment 1
Half water phosphogypsum, phosphogypsum dihydrate are prepared the 2kg raw material in the ratio of 20:80, raw material is dropped into frying in the frying pan, take out when temperature of charge reaches 200 ℃, after the material cooling ball milling to granularity be the 0.2mm square hole sieve tail over≤10%, ageing made building gypsum plaster in 3 days.
Embodiment 2
With half water phosphogypsum, the phosphogypsum dihydrate ratio proportioning 2kg raw material in 5:95, raw material is dropped into frying in the frying pan, take out when temperature of charge reaches 160 ℃, after the material cooling ball milling to granularity be the 0.2mm square hole sieve tail over≤10%, ageing made building gypsum plaster in 3 days.
Embodiment 3
With half water phosphogypsum, the phosphogypsum dihydrate ratio proportioning 2kg raw material in 10:90, raw material is dropped into frying in the frying pan, take out when temperature of charge reaches 180 ℃, after the material cooling ball milling to granularity be the 0.2mm square hole sieve tail over≤10%, ageing made building gypsum plaster in 3 days.
Embodiment 4
With half water phosphogypsum, the phosphogypsum dihydrate ratio proportioning 300t raw material in 40:60, per hour carry the 20t raw material to enter equably in the downflow system rotary calciner by feeding machine, control rotary calciner temperature in is at 550-700 ℃, temperature out is at 160-180 ℃, terra alba granularity behind ball milling that calcining is good be the 0.2mm square hole sieve tail over≤10%, send into stockyard cooling, ageing after 3 days by the finished product lift, can obtain qualified building gypsum plaster.
Embodiment 5
With half water phosphogypsum, the phosphogypsum dihydrate ratio proportioning 300t raw material in 20:80, per hour carry the 20t raw material to enter equably in the downflow system rotary calciner by feeding machine, control rotary calciner temperature in is at 550-700 ℃, temperature out is at 160-180 ℃, terra alba granularity behind ball milling that calcining is good be the 0.2mm square hole sieve tail over≤10%, send into stockyard cooling, ageing after 3 days by the finished product lift, can obtain qualified building gypsum plaster.
Comparative Examples 1
Per hour carry the 20t raw material to enter equably in the downflow system rotary calciner by feeding machine 300t phosphogypsum dihydrate raw material, control rotary calciner temperature in is at 550-700 ℃, temperature out is at 160-180 ℃, terra alba granularity behind ball milling that calcining is good be the 0.2mm square hole sieve tail over≤10%, send into stockyard cooling, ageing after 3 days by the finished product lift, can obtain qualified building gypsum plaster.
The performance of the building gypsum plaster of embodiment 1～5 and Comparative Examples 1 preparation sees Table 1:
Table 1 building gypsum plaster performance table
From embodiment and Comparative Examples as can be known, the present invention is used half water and phosphogypsum dihydrate, and strictly control its proportioning, overcome the shortcoming of independent use half water or phosphogypsum dihydrate, make half water and phosphogypsum dihydrate support mutually that on performance production cost is low, and the building gypsum plaster standard consistency water requirement that makes is few, anti-folding, ultimate compression strength height have been obtained unforeseeable technique effect.
Claims (6)
1. utilize half water and phosphogypsum dihydrate to produce the method for building gypsum plaster, comprise raw material calcining, grinding and ageing operation, it is characterized in that: described raw material is half water phosphogypsum 5～60% by weight, phosphogypsum dihydrate 40～95%; The calcination process drop temperature is controlled at 140～200 ℃.
2. utilization half water according to claim 1 and phosphogypsum dihydrate are produced the method for building gypsum plaster, and it is characterized in that: described raw material is half water phosphogypsum 5～30% by weight, phosphogypsum dihydrate 70～95%.
3. utilization half water according to claim 2 and phosphogypsum dihydrate are produced the method for building gypsum plaster, and it is characterized in that: described raw material is half water phosphogypsum 15～25% by weight, phosphogypsum dihydrate 75～85%.
4. utilization half water according to claim 1 and phosphogypsum dihydrate are produced the method for building gypsum plaster, and it is characterized in that: the calcination process drop temperature is controlled at 160～180 ℃.
5. according to claim 1,2 or 3 described utilization half water and the phosphogypsum dihydrate method of producing building gypsum plaster, it is characterized in that: in the powder-grinding process control properties of powder performace be the 0.2mm square hole sieve tail over≤10%.
6. according to claim 1,2 or 3 described utilization half water and the phosphogypsum dihydrate method of producing building gypsum plaster, it is characterized in that: digestion time is 3～7 days.
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| CN104909698B (en) * | 2015-06-09 | 2016-08-24 | 武汉华中科大土木工程检测中心 | A kind of modified ardealite roadbed stuffing for expressway and preparation method thereof |
| CN105669060A (en) * | 2016-01-06 | 2016-06-15 | 贵州腾峰科技有限责任公司 | Phosphogypsum for carving and preparation method thereof |
| CN106431034B (en) * | 2016-08-31 | 2018-09-28 | 贵州川恒化工股份有限公司 | The method of half water producing building powdered gypsum by using phosphogypsum |
| CN107529537B (en) * | 2017-08-22 | 2019-04-02 | 贵州开磷磷石膏综合利用有限公司 | A kind of manufacturing method with fresh ardealite production PVC fillers |
| CN107974106A (en) * | 2017-11-30 | 2018-05-01 | 广西雅照钛白有限公司 | A kind of titanium white production technique |
| CN109553372B (en) * | 2018-12-26 | 2022-06-21 | 四川绵筑新材料有限公司 | Preparation and use methods of recyclable phosphogypsum roadbed material |
| CN111606734B (en) * | 2019-08-30 | 2022-04-19 | 北新集团建材股份有限公司 | Negative oxygen ion functional gypsum board and preparation method thereof |
| CN111792861A (en) * | 2020-07-10 | 2020-10-20 | 张冬奎 | Method for preparing high-strength ceramic mold gypsum powder by using desulfurized gypsum |
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| CN1872765A (en) * | 2006-06-06 | 2006-12-06 | 宁夏建筑材料研究院 | Method for producing architectural gypsum powder by using phosphogypsum |
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| CN1872765A (en) * | 2006-06-06 | 2006-12-06 | 宁夏建筑材料研究院 | Method for producing architectural gypsum powder by using phosphogypsum |
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